Need Advice... Preferably from experience

(please forgive my lack of reddit acronym understanding)

I am recently exited from the company I started roughly 15 years ago. While I should be 8 figures, my crap education and lack of contract law understanding landed me in the mid 7 figure range after a protracted and... Unpleasant... negotiated departure.

I'm a self-made man. I came from Detroit style poverty and worked my way to success without screwing anyone, and actually providing significant, life changing opportunities to people who'd otherwise face a lifetime of drudgery/crime/poverty (this, more than the money, is what I'm most proud of).

I'm in my mid 40s, debt free, making $250k+, with $500k in 401k, and about $3m in cash. I have no idea what to do with the $3m.

I'm a work horse of the worse stripe; honest, hard working, with a laser focus on integrity and honor. I'm perfectly happy to put myself in life and death situations (with the right training to hedge). I have young children and a wife whom I love dearly who is likely to live forever, so I can't throw my chips into the wind as I would have when I started my journey.

My journey has been as hard as you could imagine, so I'm hateful to the idea of just handing my money over to a stranger and "hoping" it just magically grows into something... Because my experience has taught me that wealth is earned through blood, sweat, tears, and ruthless attention.

I'm looking for some advice, any advice, on what to do with this pile of money. I don't care about philanthropy. I will make the world around me better with effort and will. I want this money to care for my wife and children whom are innocent.

I've take a temporary gig working on outer space stuff (which is cool) and do Unreal Engine development to scratch the cheap hobby itch. My background is tech.

Open fire.